OMA Lightweight M2M is a protocol from the Open Mobile Alliance for M2M or IoT device management.
In order to help you test your LWM2M solutions quickly, the Leshan project provides a Lightweight M2M standalone server you can freely connect to for evaluation purposes.
A problem? A missing feature? An idea? Contact the community.
Wakaama is a LWM2M written in C and designed to be portable on POSIX compliant systems.